Evolutionary aspects and north-south asymmetry of soft X-ray flare index during solar cycles 21, 22, and 23B. Joshi, R. Bhattacharyya, K. K. Pandey, U. Kushwaha and Yong-Jae MoonA&A, 582 (2015) A4DOI: https://doi.org/10.1051/0004-6361/201526369
